I've a project created with C51 v7.02a A51 v7.02 BL51 v5.02 I can compile it without problems, but When I want to compile it with another machine containing the following toolchain C51 v7.50 A51 v7.10 BL51 v5.12 I got environ 254 errors with it ! What can cause to this problem ? I can fix these errors but I want to know why such a modification occurs at object modules ? we planned to update our softwares to newest one but this example confuse our mind ! Any Idea